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US 5,471,537 AGranted
Kitchen ventilator
AssigneeAktiebolaget Electrolux
InventorLennart W. Castwall
Life of this patent
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AssigneeAktiebolaget Electrolux
InventorLennart W. Castwall
Estimating the term…
A kitchen ventilator includes a housing (10) having a motor powered fan (20), an inlet (11), an inlet passage (25) between the inlet and the fan, an outlet (17), and an outlet passage (23) between the fan and the outlet, the passages are separated by a generally vertical partition wall (22). The inlet passage is partially formed by a baffle wall (26) provided between the inlet and the fan, and a removable front wall (16) provided with a sound absorbing material, and the outlet passage (23) has a narrowing portion (33) which is provided on both sides with sound absorbing material (18, 19). For reducing the noise level, the ventilator is provided with an acoustic sensor (28) for sensing the noise of the fan, a loudspeaker (30) for emitting a sound silencing the fan noise in reverse phase therewith, and an electronic control unit (29) connected to the sensor and the loudspeaker and adapted to control the loudspeaker in response to information received from said sensor.
Kitchen ventilator comprising a housing (10), a motor powered fan (20) having a horizontal axis arranged in a bottom portion of the housing, an inlet (11), an inlet passage (25) extending between the inlet and the fan, an outlet (17), an outlet passage (23) extending between the fan and the outlet, and a removable front wall (16) including sound absorbing material, said passages being separated by a generally vertical partition wall (22) which defines an opening through which air from the inlet passage is drawn by said fan into said outlet passage, wherein the inlet passage is defined in part by a baffle wall (26) provided between the inlet (11) and the fan (20), said baffle wall (26) forcing air entering said inlet to flow in an indirect path toward said fan and helping to reduce the transmission of noise from said fan to said inlet, said outlet passage (23) having a narrowing portion (33) which is bounded on opposite sides by sound absorbing material (18, 19).
Dependencies are inferred from the claim text.